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Netgear XR500 - Nighthawk Pro Gaming Manual

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Application Example: Make a Local Web Server Public
If you host a web server on your local network, you can use port forwarding to allow web requests from
anyone on the Internet to reach your web server.
To make a local web server public:
1. Assign your web server either a fixed IP address or a dynamic IP address using DHCP address
reservation.
In this example, your router always gives your web server an IP address of 192.168.1.33.
2. On the Port Forwarding page, configure the router to forward the HTTP service to the local address of
your web server at 192.168.1.33.
HTTP (port 80) is the standard protocol for web servers.
3. (Optional) Register a host name with a Dynamic DNS service (see Set Up and Manage Dynamic DNS
on page 135) and specify that name on the Dynamic DNS page of the router.
Dynamic DNS makes it much easier to access a server from the Internet because you can type the
name in the Internet browser. Otherwise, you must know the IP address that the ISP assigned, which
typically changes.
How the Router Implements a Port Forwarding Rule
The following sequence shows the effects of a port forwarding rule:
1. When you type the URL www.example.com in your browser, the browser sends a web page request
message with the following destination information:
• Destination address.The IP address of www.example.com, which is the address of your router.
• Destination port number. 80, which is the standard port number for a web server process.
Your router receives the message and finds your port forwarding rule for incoming port 80 traffic.
2. The router changes the destination in the message to IP address 192.168.1.123 and sends the message
to that computer.
3. Your web server at IP address 192.168.1.123 receives the request and sends a reply message to your
router.
4. Your router performs Network Address Translation (NAT) on the source IP address and sends the reply
through the Internet to the computer or mobile device that sent the web page request.
Manage Port Triggering for Services and Applications
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
• An application must use port forwarding to more than one local computer (but not simultaneously).
• An application must open incoming ports that are different from the outgoing port.
With port triggering, the router monitors traffic to the Internet from an outbound “trigger” port that you specify.
For outbound traffic from that port, the router saves the IP address of the computer that sent the traffic.The
Manage and Customize Internet Traffic Rules for Ports
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XR500 Nighthawk Pro Gaming Router
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